As you can see from the waveform and the frequency counter at the bottom, this little module seems very accurate. Since it also produces a square wave output, I may try to build a little function generator.
I also tried my hand at some surface mount soldering. I picked up a few bare si5351 chips and some little adapter boards. I was just able to get it done with the big chisel tip I had on the iron, but before I do any more, I’m going to pick up a finer tip. I may try the solder paste and heat gun thing as well.